allow parallelized encyption

In fact only the block solving cannot be parallelized, but the oracle
function can.

Author: djosix

README.md

@@ -64,12 +64,17 @@ plaintext = decrypt(
 
 ### Encryption
 
-Below is an example demonstrating how to encrypt arbitrary bytes. For a detailed understanding of the process, please refer to [this Pull Request](https://github.com/djosix/padding_oracle.py/pull/4). Keep in mind that, unlike the decryption process, this functionality cannot be parallelized.
+Below is an example demonstrating how to encrypt arbitrary bytes. For a detailed understanding of the process, please refer to [this Pull Request](https://github.com/djosix/padding_oracle.py/pull/4).
 
 ```python
 from padding_oracle import encrypt
 
-ciphertext = encrypt(b'YourTextHere', block_size=16, oracle=oracle)
+ciphertext = encrypt(
+    b'YourTextHere', 
+    block_size=16,
+    oracle=oracle,
+    num_threads=16,
+)
 ```
 
 ### Customized Logging

src/padding_oracle/padding_oracle.py

@@ -65,6 +65,7 @@ def encrypt(
     plaintext: bytes | str,
     block_size: int,
     oracle: OracleFunc,
+    num_threads: int = 1,
     logger: Logger = default_logger,
 ) -> bytes:
     plaintext = to_bytes(plaintext)
@@ -81,7 +82,7 @@ def encrypt(
             iv + cipher_blocks[i],
             block_size,
             oracle,
-            1,
+            num_threads,
             block_error_logger(logger),
             encrypt_progress_logger(logger, i+1, len(plain_blocks)),
         )

tests/test_padding_oracle.py

@@ -27,6 +27,7 @@ def test_padding_oracle_encrypt():
         plaintext,
         cryptor.block_size,
         cryptor.oracle,
+        num_threads=4,
     )
 
     assert cryptor.decrypt(encrypted) == plaintext